#660703
Closest named color: Reddy Brown (#6E1005). oklch(32.5% 0.127 29.6), rgb(102, 7, 3).
Aa
White text reads best on this color (13.15:1).
About this color
#660703 is a dark, moderately saturated red. In OKLCH its lightness is 33%, its chroma 0.127 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.023 away. White text reads best on it, at 13.15:1.
| Hue family | Reds |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.127) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.59:1 |
| White text | 13.15:1 |
Values
| HEX | #660703 |
| RGB | rgb(102, 7, 3) |
| HSL | hsl(2, 94%, 21%) |
| OKLCH | oklch(32.5% 0.127 29.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #660703 | 13.15:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #660703 | 1.59:1 | Fails | Lc 0.0 | Not readable |
| #660703 text on white | 13.15:1 | AAA | Lc 97.8 | Preferred for body text |
| #660703 text on black | 1.59:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#FEF2F0
oklch(97% 0.013 28.9)
-
Step 100
100
#FCE4DF
oklch(93.7% 0.027 31.7)
-
Step 200
200
#FACDC5
oklch(88.5% 0.052 29.9)
-
Step 300
300
#F8AA9D
oklch(81% 0.095 29.7)
-
Step 400
400
#F07766
oklch(70.6% 0.152 29.6)
-
Step 500
500
#E74C3B
oklch(63.1% 0.194 29.7)
-
Step 600
600
#D32115
oklch(55.6% 0.212 29.6)
-
Step 700
700
#B60C04
oklch(49.1% 0.196 29.6)
-
Step 800
800
#94130B
oklch(42.7% 0.163 29.5)
-
Step 900
900 (this color)
#660703
oklch(32.5% 0.127 29.6)
-
Step 950
950
#46120D
oklch(27% 0.081 29)
#660703 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #292301 | 0.138 |
| Deuteranopia (no green cones) | #3F3700 | 0.123 |
| Tritanopia (no blue cones) | #710008 | 0.025 |
| Achromatopsia (no color) | #303030 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #660703
#660703
oklch(32.5% 0.127 29.6)
- #003C44
#003C44
oklch(32.6% 0.056 209.4)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #660703, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.023
- Claret #680018 ΔE 0.025
- Blood #770001 ΔE 0.038
- Burgundy #610023 ΔE 0.045
- Maroon #800000 ΔE 0.058
- Wine Red #7B0323 ΔE 0.059
- Chestnut #742802 ΔE 0.067
- Bordeaux #7B002C ΔE 0.068
Use #660703 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.